A single server that handles both HTTP and HTTPS requests

a single server that handles both HTTP and HTTPS requests

A single HTTP/HTTPS server
It is possible to configure a single server that handles both HTTP and HTTPS requests:

server {
    listen              80;
    listen              443 ssl;
    server_name         www.example.com;
    ssl_certificate     www.example.com.crt;
    ssl_certificate_key www.example.com.key;
    ...
}

参考

http://nginx.org/en/docs/http/configuring_https_servers.html#single_http_https_server